1660s, "not made better," from un- (1) "not" + past participle of improve (v.). Sense of "not developed or taken advantage of" (of land) is recorded from 1781.
雙語例句
1. Taxes on unimproved land are low.
對未耕種的土地的稅收很低.
來自互聯(lián)網(wǎng)
2. Clearly developing improved humans will create great social and political problems with respect to unimproved humans.